body {
  width: 100%;
  height: 100vh;
  margin: 0; /* body의 기본 마진을
    제거합니다. */
}
.modal {
  display: none;
  position: fixed;
  top: 50% !important;
  left: 50% !important;
  transform: translate(-50%, -50%) !important;
  max-width: 300px;
  width: 100%;
  background-color: #fff;
  max-height: 130px;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  text-align: center;
  z-index: 1000;
}
.modal-content {
  text-align: center;
  padding: 15px;
}
.close {
  cursor: pointer;
  float: right;
}